With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swDULDAdminState
Switch DULD Admin State
1.3.6.1.4.1.171.12.87.1.1.1.2
This object indicates the unidirectional link detection configuration status.
Back to DULD-MIB MIB page.
IPHost Network monitor allows you to monitor swDULDAdminState on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link WiFi routers right now.